base chat module

Chat/Core/Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Chat/Core/PClient.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core
+{
+	public class PClient
+	{
+		private Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+		private EndPoint endPoint;
+
+		public PClient(string ip, int port)
+		{
+			endPoint = new IPEndPoint(IPAddress.Parse(ip), port);
+		}
+
+		public async Task StartAsync()
+		{
+			await socket.ConnectAsync(endPoint);
+			while (true)
+			{
+				string str = Console.ReadLine() ?? string.Empty;
+				byte[] dataBuffer = Encoding.UTF8.GetBytes(str);
+				byte[] headerBuffer = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)dataBuffer.Length));
+
+				await socket.SendAsync(headerBuffer, SocketFlags.None);
+				await socket.SendAsync(dataBuffer, SocketFlags.None);
+			}
+		}
+	}
+}

Chat/Core/PServer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core
+{
+	public class PServer
+	{
+		private Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+
+		public PServer(string ip, int port, int backlog)
+		{
+			IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(ip), port);
+			serverSocket.Bind(endPoint);
+			serverSocket.Listen(backlog);
+		}
+
+		public async Task StartAsync()
+		{
+			while (true)
+			{
+				Socket clientSocket = await serverSocket.AcceptAsync();
+				Console.WriteLine($"[{DateTime.Now}] Accept client: {clientSocket.RemoteEndPoint}");
+				ThreadPool.QueueUserWorkItem(RunAsync, clientSocket);
+			}
+		}
+
+		private async void RunAsync(object? sender)
+		{
+			if (sender == null)
+				return;
+
+			Socket clientSocket = (Socket)sender;
+			byte[] headerBuffer = new byte[2];
+
+			while (true)
+			{
+				// header buffer
+				int n1 = await clientSocket.ReceiveAsync(headerBuffer, SocketFlags.None);
+				if (n1 < 1)
+				{
+					Console.WriteLine($"[{DateTime.Now}] Disconnect client: {clientSocket.RemoteEndPoint}");
+					clientSocket.Dispose();
+					return;
+				}
+				else if (n1 == 1)
+				{
+					await clientSocket.ReceiveAsync(new ArraySegment<byte>(headerBuffer, 1, 1), SocketFlags.None);
+				}
+
+				// data buffer
+				short dataSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(headerBuffer));
+				byte[] dataBuffer = new byte[dataSize];
+
+				int totalRecv = 0;
+				while (totalRecv < dataSize)
+				{
+					int n2 = await clientSocket.ReceiveAsync(new ArraySegment<byte>(dataBuffer, totalRecv, dataSize - totalRecv), SocketFlags.None);
+					totalRecv += n2;
+				}
+				Console.WriteLine($"[{DateTime.Now}] {clientSocket.RemoteEndPoint} client: {Encoding.UTF8.GetString(dataBuffer)}");
+			}
+		}
+	}
+}